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THE FILM 183
adjustment that will remove 1 1000 of an inch of surface, and no more.
A dry metal scraper adjusted to remove just enough surface will wear away slightly after the first half d< splices so that thereafter a thin coating of emulsion will always remain on the stub end. If it is adjusted to remove a bit more than is necessary, it will weaken the stock and the splice. It is, therefore, better to have a splicer that depends on wet scraping. If this is not available, remove the scraper from the splicing mechanism and perform the operation by hand. In that event provide the splicer with a properly located straight edge.
Wet scraping by hand gives little trouble if the brush and water are handily located and a safety razor blade, clamped in a holder, is used. A good blade holder may be secured in almost any Woolworth store.
The projectionist may construct a home-made splicer, but we advise against it because a home-made affair is not likely to do the job as perfectly as a well designed. well constructed factory-made mechanism.
Storing Film in Projection Rooms
(39) Proper storage of film in projection rooms has been considered heretofore almost wholly from the viewpoint of fire hazard — an error of thought that has cost exhibitors many thousands of dollars that might otherwise have been saved.
(40) New film is very tough and pliable. It may be sharply bent or creased without breaking, a condition that would last almost indefinitely were film always stored in humid atmosphere. But unfortunately it seldom has been in the past either in the exchange or in the projection room.
(41) In the course of projection the intense heat of the spot at the projector aperture raises the temperature of the film, driving out a portion of the moisture it contained. (42) Were the film rewound and immediately stored in an atmosphere of high humidity, at least a goodly portion of the expelled moisture would be recovered.